If the call comes from AA to a station and the station has CF-ALL activated, you must have a few pauses in the extension field of the voicemail box and then an "H" on the end to hangup (assuming the default that the VM is not set to do this). On analog POTS trunks a call must completely setup before the voicemail disconnects on Toshiba systems.

PRI, and presumably SIP, don't have this requirement so it can be frustrating to see it work flawlessly on those type of trunks and not POTS.

We have been urging our customers to use the service provider's Call Forwarding when possible for this reason, among many others. We get pushback but we stand our ground and they eventually get it done. Our customer base is large enough that it is not worth the effort to try and troubleshoot all the requests when we know the service provider can do this better than the PBX where POTS trunks are involved.

Michael Meyer